Psychopharmacology — MCQs

Q: Clozapine is used in:

Resistant schizophrenia. **Explanation:** **Clozapine** is an atypical (second-generation) antipsychotic and is considered the **gold standard** for the management of **Treatment-Resistant Schizophrenia (TRS)**. 1. **Why Option B is Correct:** Resistance in schizophrenia is defined as a lack of satisfactory clinical improvement despite the use of adequate doses of at least two different antipsychotics (including one atypical) for a duration of 6–8 weeks each. Clozapine is uniquely effective in these cases due to its complex receptor profile (low D2 affinity, high 5-HT2A, D4, and alpha-adrenergic blockade). It is the only antipsychotic proven to reduce suicidal behavior in schizophrenic patients. 2. **Why Other Options are Incorrect:** * **A. Depression:** First-line treatments are SSRIs/SNRIs. While some atypicals (like Quetiapine or Aripiprazole) are used as adjuncts in resistant depression, Clozapine is not used due to its side-effect profile. * **C. Mania:** Acute mania is treated with Lithium, Valproate, or standard antipsychotics (e.g., Olanzapine, Risperidone). Clozapine is reserved only for ultra-resistant cases, not as a standard indication. * **D. Delirium:** Low-dose Haloperidol is the drug of choice. Clozapine is contraindicated in delirium because its strong anticholinergic properties can worsen the confusional state. **High-Yield Clinical Pearls for NEET-PG:** * **Agranulocytosis:** The most dreaded side effect (occurs in ~1%). Mandatory **WBC monitoring** is required (weekly for the first 6 months). * **Seizures:** Clozapine carries a dose-dependent risk of seizures. * **Sialorrhea:** Paradoxical hypersalivation is a common, bothersome side effect. * **Myocarditis:** A rare but fatal side effect; monitor for tachycardia and chest pain. * **Metabolic Syndrome:** High risk of weight gain and diabetes (similar to Olanzapine).

Q: Which antipsychotic has anti-suicidal properties?

clozapine. **Explanation:** **Clozapine** is the correct answer because it is the only antipsychotic with a specifically FDA-approved indication for reducing the risk of recurrent suicidal behavior in patients with schizophrenia or schizoaffective disorder. This anti-suicidal effect is independent of its primary antipsychotic action and is believed to be mediated by its unique modulation of serotonergic (5-HT2A) and noradrenergic systems, which helps reduce impulsivity and aggression. **Analysis of Incorrect Options:** * **B. Chlorpromazine:** A typical (first-generation) antipsychotic primarily used for acute psychosis. While it treats positive symptoms, it has no proven specific anti-suicidal properties and may even worsen depressive symptoms in some patients. * **C. Aripiprazole:** A partial dopamine agonist. While effective for mood stabilization and augmentation in depression, it does not carry a specific indication for suicide prevention. * **D. Amisulpride:** A substituted benzamide that is effective for both positive and negative symptoms of schizophrenia, but lacks evidence for a direct anti-suicidal effect. **High-Yield Clinical Pearls for NEET-PG:** * **The "Rule of Two":** There are two main drugs in psychiatry known for reducing suicide risk: **Clozapine** (in Schizophrenia) and **Lithium** (in Bipolar Disorder). * **Clozapine Monitoring:** Due to the risk of **agranulocytosis**, regular monitoring of Absolute Neutrophil Count (ANC) is mandatory. * **Other Side Effects:** Clozapine is associated with the highest risk of seizures (dose-dependent), sialorrhea (drooling), myocarditis, and metabolic syndrome among antipsychotics. * **Indication:** It remains the gold standard for **Treatment-Resistant Schizophrenia** (defined as failure of two adequate trials of other antipsychotics).

Q: Use of lithium in pregnancy can result in which of the following abnormalities in the baby?

Ebstein's anomaly. **Explanation:** The correct answer is **Ebstein’s anomaly**. Lithium is a mood stabilizer used primarily for Bipolar Disorder. When taken during the first trimester of pregnancy, it acts as a teratogen, specifically affecting cardiac development. **1. Why Ebstein’s Anomaly is Correct:** Ebstein’s anomaly is a rare congenital heart defect characterized by the **downward displacement of the tricuspid valve** leaflets into the right ventricle ("atrialization" of the right ventricle). While the absolute risk remains low (approx. 1 in 1,000 to 2,000 exposures), it represents a significant increase compared to the general population. **2. Analysis of Incorrect Options:** * **Anencephaly:** This is a neural tube defect (NTD). NTDs are more commonly associated with **Valproate** or Carbamazepine use during pregnancy, not Lithium. * **Caudal dysgenesis syndrome:** This is a rare malformation (sacral agenesis) highly specific to **maternal diabetes mellitus**. * **Elfin facies:** This facial phenotype (along with hypercalcemia and supravalvular aortic stenosis) is characteristic of **Williams Syndrome**, a genetic deletion on chromosome 7. **Clinical Pearls for NEET-PG:** * **Monitoring:** If a pregnant woman must continue Lithium, fetal echocardiography is recommended at 18–22 weeks. * **Dosage:** Lithium clearance increases during pregnancy (due to increased GFR) and drops abruptly at delivery; close serum monitoring is vital to avoid toxicity. * **Breastfeeding:** Lithium is generally discouraged during breastfeeding as it is excreted in milk and can cause "Floppy Baby Syndrome" (hypotonia, cyanosis). * **Alternative:** Lamotrigine is often considered a safer mood stabilizer during pregnancy regarding structural malformations.

Q: Which of the following antipsychotic medications carries the least risk of metabolic side effects?

Ziprasidone. **Explanation:** The metabolic profile of second-generation (atypical) antipsychotics is a high-yield topic for NEET-PG. These drugs are associated with weight gain, dyslipidemia, and insulin resistance due to their affinity for H1 and 5-HT2C receptors. **Why Ziprasidone is Correct:** **Ziprasidone** (along with Aripiprazole and Lurasidone) is considered **metabolically neutral**. It has a very low affinity for histamine (H1) receptors, resulting in minimal weight gain and negligible impact on blood glucose or lipid levels. While it carries a risk of QTc prolongation, its metabolic safety profile is superior to most other atypicals. **Analysis of Incorrect Options:** * **Clozapine (D) & Olanzapine (B):** These are the **worst offenders**. They have the highest risk of significant weight gain, sedation, and new-onset Diabetes Mellitus. Clozapine is the most metabolic-heavy, followed closely by Olanzapine. * **Risperidone (A):** This drug carries a **moderate risk**. While less severe than Olanzapine, it still causes significant weight gain and is notably associated with the highest risk of hyperprolactinemia among atypicals. **NEET-PG High-Yield Pearls:** * **Mnemonic for Metabolic Risk (Highest to Lowest):** "**C**ome **O**n **Q**uietly **R**isperidone **A**nd **Z**iprasidone" (**C**lozapine > **O**lanzapine > **Q**uetiapine > **R**isperidone > **A**ripiprazole/**Z**iprasidone). * **Ziprasidone** must be taken **with food** (minimum 500 calories) for adequate absorption. * **Monitoring:** Patients on Clozapine/Olanzapine require regular monitoring of BMI, waist circumference, fasting glucose, and lipid profiles.

Q: Beta-adrenergic receptor antagonists such as propranolol are used in the treatment of which of the following conditions?

All of the above. **Explanation:** Beta-adrenergic receptor antagonists (Beta-blockers), specifically **Propranolol**, are widely used in psychiatry to manage the peripheral autonomic symptoms of anxiety and specific drug-induced side effects. * **Performance Anxiety:** Propranolol is the drug of choice for "stage fright." It works by blocking the peripheral effects of adrenaline, thereby reducing tremors, palpitations, tachycardia, and sweating without causing the sedation associated with benzodiazepines. * **Lithium-Induced Tremor:** Fine resting tremors are a common side effect of Lithium therapy. Propranolol is the most effective treatment for managing these tremors, allowing patients to continue their mood-stabilizer regimen. * **Substance Use Disorders:** Beta-blockers are used as adjuncts in managing **Alcohol Withdrawal** (to control autonomic hyperactivity like tachycardia and hypertension) and are also used to treat **Akathisia** (subjective restlessness) caused by antipsychotics. **Clinical Pearls for NEET-PG:** 1. **Akathisia:** Propranolol is the **first-line treatment** for antipsychotic-induced akathisia. 2. **Specific Phobia:** It is used specifically for the "Performance Type" of Social Anxiety Disorder. 3. **Contraindications:** Always screen for **Asthma or COPD** before prescribing, as non-selective beta-blockers can cause life-threatening bronchospasm. They should also be avoided in patients with insulin-dependent diabetes (masks hypoglycemia symptoms) and bradycardia. 4. **Lipophilicity:** Propranolol is highly lipophilic, allowing it to cross the blood-brain barrier effectively.

Q: A patient with maniac depressive psychosis is on lithium, clozapine, and fluphenazine. During the course of treatment, he developed seizures, tremors, excessive thirst, and recurrent episodes of urination. Which drug is most likely responsible for these complications?

Lithium. ### Explanation The correct answer is **Lithium**. This question tests the ability to differentiate the side effect profiles of multiple psychotropic drugs administered simultaneously. **Why Lithium is the correct answer:** Lithium has a narrow therapeutic index and is notorious for multisystem side effects. The symptoms described in the patient are classic manifestations of Lithium toxicity and its physiological effects: * **Excessive thirst (Polydipsia) and Recurrent urination (Polyuria):** Lithium causes **Nephrogenic Diabetes Insipidus** by interfering with the action of ADH (Vasopressin) on the collecting ducts of the kidney. * **Tremors:** Fine tremors are a common side effect, while coarse tremors often indicate Lithium toxicity. * **Seizures:** At toxic levels (>2.0 mEq/L), Lithium is highly neurotoxic and can precipitate seizures. **Why other options are incorrect:** * **Clozapine:** While Clozapine is the antipsychotic most strongly associated with a dose-dependent risk of **seizures**, it does not cause polyuria or polydipsia. Its hallmark side effects are agranulocytosis, sialorrhea (drooling), and myocarditis. * **Fluphenazine:** A high-potency typical antipsychotic primarily associated with **Extrapyramidal Side Effects (EPS)** like dystonia, akathisia, and parkinsonism. It does not cause the renal symptoms described. **High-Yield Clinical Pearls for NEET-PG:** * **Monitoring:** Therapeutic drug monitoring (TDM) is essential for Lithium. Target serum levels: 0.6–1.2 mEq/L (Prophylaxis/Maintenance) and 0.8–1.5 mEq/L (Acute Mania). * **Renal Impact:** Lithium is the drug of choice for Bipolar Disorder but is contraindicated in renal failure. * **L-C-S Triad:** Remember **L**ithium, **C**lozapine, and **S**ertraline (in SSRI withdrawal) can all lower the seizure threshold, but only Lithium explains the constellation of renal and neurological symptoms provided.

Q: What is the best choice of antianxiety agent for a 40-year-old woman with generalized anxiety disorder and a history of benzodiazepine abuse?

buspirone. **Explanation:** The correct answer is **Buspirone**. **Why Buspirone is the best choice:** Generalized Anxiety Disorder (GAD) often requires long-term pharmacological management. In a patient with a history of **substance abuse or benzodiazepine (BZD) dependence**, BZDs are contraindicated due to their high potential for addiction, tolerance, and withdrawal. * **Mechanism:** Buspirone is a **5-HT1A partial agonist**. * **Clinical Advantage:** Unlike BZDs, it has **no potential for abuse or addiction**, does not cause sedation, and does not potentiate the effects of alcohol. This makes it the ideal "non-addictive" alternative for chronic anxiety in high-risk patients. **Why other options are incorrect:** * **Zolpidem (A):** This is a non-benzodiazepine sedative-hypnotic ("Z-drug") used primarily for insomnia, not GAD. While it has a different structure, it still carries a risk of dependence and misuse. * **Flurazepam (B) & Clonazepam (C):** Both are benzodiazepines. Flurazepam is long-acting and used for insomnia; Clonazepam is used for GAD and panic disorder. Both are strictly avoided in patients with a history of drug abuse due to the risk of relapse and physiological dependence. **NEET-PG High-Yield Pearls:** * **Lag Period:** Buspirone takes **2–4 weeks** to show therapeutic effects; it is not useful for acute anxiety attacks (unlike BZDs). * **Side Effects:** Dizziness, nausea, and headache are common. It does *not* cause muscle relaxation or anticonvulsant effects. * **Drug of Choice for GAD:** While SSRIs/SNRIs are first-line, Buspirone is a specific high-yield answer for GAD patients with **addiction history**.

Q: Long-term antipsychotic use may cause which of the following?

Tardive dyskinesia. **Explanation:** **Correct Answer: D. Tardive dyskinesia** **Mechanism:** Tardive dyskinesia (TD) is a late-onset extrapyramidal side effect (EPS) resulting from the chronic use of dopamine receptor antagonists (antipsychotics). The underlying pathophysiology involves **dopamine receptor supersensitivity**. Long-term blockade of $D_2$ receptors in the nigrostriatal pathway leads to an up-regulation and increased sensitivity of these receptors. Consequently, even small amounts of dopamine trigger an exaggerated response, manifesting as involuntary, choreoathetoid movements, typically involving the tongue, face (e.g., lip-smacking), and extremities. **Analysis of Incorrect Options:** * **A. Depression:** While some patients may experience "post-psychotic depression" or "neuroleptic-induced deficit syndrome" (mimicking negative symptoms), antipsychotics are not a primary cause of clinical depression; in fact, some are used as adjuncts in treatment-resistant depression. * **B. Mania:** Antipsychotics are dopamine antagonists and are used to *treat* mania. They do not cause mania. * **C. Schizophrenia:** Antipsychotics are the primary treatment for schizophrenia. While "supersensitivity psychosis" is a theoretical risk upon abrupt withdrawal, the drugs do not cause the disease itself. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Elderly females and patients with affective disorders are at higher risk for TD. * **Management:** The first step is to reduce the dose or switch to an atypical antipsychotic with lower $D_2$ affinity (e.g., **Clozapine** or Quetiapine). * **Treatment:** VMAT-2 inhibitors (e.g., **Valbenazine**, Deutetrabenazine) are now FDA-approved for TD. * **Warning:** Anticholinergics (like Trihexyphenidyl) often **worsen** TD symptoms, unlike other EPS.

Q: A middle-aged man presents with restlessness, pacing, and hand tremor. He reports taking haloperidol for mania for the past two months. Which of the following conditions is the patient most likely suffering from?

Akathisia. ### Explanation **Correct Option: C. Akathisia** The patient is presenting with **Akathisia**, the most common Extrapyramidal Side Effect (EPS) associated with typical antipsychotics like Haloperidol. Akathisia is characterized by a subjective feeling of inner restlessness and an objective need to move. Clinically, this manifests as **pacing, shifting weight from foot to foot, or inability to sit still**. It typically occurs within days to weeks of starting or increasing the dose of a dopamine antagonist. **Analysis of Incorrect Options:** * **A. Dystonia:** This involves involuntary, sustained muscle contractions leading to abnormal postures (e.g., torticollis, oculogyric crisis). It usually occurs acutely (within hours to days) rather than after two months. * **B. Restless Legs Syndrome (RLS):** While symptoms are similar, RLS typically occurs at rest or before sleep and is relieved by movement. It is not primarily caused by antipsychotics, though they can exacerbate it. * **D. Anhedonia:** This is a psychological symptom (inability to feel pleasure) common in depression and schizophrenia, not a motor restlessness disorder. **High-Yield Clinical Pearls for NEET-PG:** * **Management of Akathisia:** The first-line treatment is **Beta-blockers (Propranolol)**. Centrally acting benzodiazepines or anticholinergics (Benztropine) are second-line. * **Timeline of EPS:** 1. **Acute Dystonia:** Hours to days. 2. **Akathisia:** Days to weeks. 3. **Drug-induced Parkinsonism:** Weeks to months. 4. **Tardive Dyskinesia:** Months to years (long-term use). * **Key Distinction:** Unlike Parkinsonian tremors, the "tremor" in akathisia is often just a manifestation of the constant urge to move.

Q: Stevens-Johnson syndrome is a known side effect of which of the following medications?

Carbamazepine. **Explanation:** **Stevens-Johnson Syndrome (SJS)** and its more severe variant, Toxic Epidermal Necrolysis (TEN), are life-threatening mucocutaneous reactions characterized by epidermal detachment. **Carbamazepine** is a notorious trigger for SJS, particularly in patients of Asian descent. This is strongly associated with the **HLA-B*1502 allele**; screening for this genetic marker is recommended before initiating treatment to mitigate risk. Other common psychiatric drugs causing SJS include Lamotrigine and Phenytoin. **Analysis of Incorrect Options:** * **Lithium:** Its most characteristic side effects include fine tremors, polyuria (nephrogenic diabetes insipidus), hypothyroidism, and teratogenicity (Ebstein’s anomaly). It does not typically cause SJS. * **Clozapine:** This atypical antipsychotic is most famously associated with **agranulocytosis** (requiring regular CBC monitoring), seizures, and myocarditis. * **Clonazepam:** As a benzodiazepine, its primary side effects are sedation, ataxia, and potential for dependence/withdrawal. Skin reactions are extremely rare. **Clinical Pearls for NEET-PG:** * **Lamotrigine** is the mood stabilizer with the highest risk of SJS if titrated too rapidly ("Start low, go slow"). * **HLA-B*1502** is the specific screening marker for Carbamazepine-induced SJS in Asian populations. * **HLA-A*3101** is another marker associated with Carbamazepine-induced hypersensitivity in Europeans. * If a patient on Carbamazepine or Lamotrigine develops a rash or mucosal involvement, the drug must be **stopped immediately**.

Psychopharmacology Indian Medical PG Practice Questions and MCQs

Question 1: Clozapine is used in:

A. Depression
B. Resistant schizophrenia (Correct Answer)
C. Mania
D. Delirium

Explanation: **Explanation:** **Clozapine** is an atypical (second-generation) antipsychotic and is considered the **gold standard** for the management of **Treatment-Resistant Schizophrenia (TRS)**. 1. **Why Option B is Correct:** Resistance in schizophrenia is defined as a lack of satisfactory clinical improvement despite the use of adequate doses of at least two different antipsychotics (including one atypical) for a duration of 6–8 weeks each. Clozapine is uniquely effective in these cases due to its complex receptor profile (low D2 affinity, high 5-HT2A, D4, and alpha-adrenergic blockade). It is the only antipsychotic proven to reduce suicidal behavior in schizophrenic patients. 2. **Why Other Options are Incorrect:** * **A. Depression:** First-line treatments are SSRIs/SNRIs. While some atypicals (like Quetiapine or Aripiprazole) are used as adjuncts in resistant depression, Clozapine is not used due to its side-effect profile. * **C. Mania:** Acute mania is treated with Lithium, Valproate, or standard antipsychotics (e.g., Olanzapine, Risperidone). Clozapine is reserved only for ultra-resistant cases, not as a standard indication. * **D. Delirium:** Low-dose Haloperidol is the drug of choice. Clozapine is contraindicated in delirium because its strong anticholinergic properties can worsen the confusional state. **High-Yield Clinical Pearls for NEET-PG:** * **Agranulocytosis:** The most dreaded side effect (occurs in ~1%). Mandatory **WBC monitoring** is required (weekly for the first 6 months). * **Seizures:** Clozapine carries a dose-dependent risk of seizures. * **Sialorrhea:** Paradoxical hypersalivation is a common, bothersome side effect. * **Myocarditis:** A rare but fatal side effect; monitor for tachycardia and chest pain. * **Metabolic Syndrome:** High risk of weight gain and diabetes (similar to Olanzapine).

Question 2: Which antipsychotic has anti-suicidal properties?

A. clozapine (Correct Answer)
B. chlorpromazine
C. aripiprazole
D. amisulpride

Explanation: **Explanation:** **Clozapine** is the correct answer because it is the only antipsychotic with a specifically FDA-approved indication for reducing the risk of recurrent suicidal behavior in patients with schizophrenia or schizoaffective disorder. This anti-suicidal effect is independent of its primary antipsychotic action and is believed to be mediated by its unique modulation of serotonergic (5-HT2A) and noradrenergic systems, which helps reduce impulsivity and aggression. **Analysis of Incorrect Options:** * **B. Chlorpromazine:** A typical (first-generation) antipsychotic primarily used for acute psychosis. While it treats positive symptoms, it has no proven specific anti-suicidal properties and may even worsen depressive symptoms in some patients. * **C. Aripiprazole:** A partial dopamine agonist. While effective for mood stabilization and augmentation in depression, it does not carry a specific indication for suicide prevention. * **D. Amisulpride:** A substituted benzamide that is effective for both positive and negative symptoms of schizophrenia, but lacks evidence for a direct anti-suicidal effect. **High-Yield Clinical Pearls for NEET-PG:** * **The "Rule of Two":** There are two main drugs in psychiatry known for reducing suicide risk: **Clozapine** (in Schizophrenia) and **Lithium** (in Bipolar Disorder). * **Clozapine Monitoring:** Due to the risk of **agranulocytosis**, regular monitoring of Absolute Neutrophil Count (ANC) is mandatory. * **Other Side Effects:** Clozapine is associated with the highest risk of seizures (dose-dependent), sialorrhea (drooling), myocarditis, and metabolic syndrome among antipsychotics. * **Indication:** It remains the gold standard for **Treatment-Resistant Schizophrenia** (defined as failure of two adequate trials of other antipsychotics).

Question 3: Use of lithium in pregnancy can result in which of the following abnormalities in the baby?

A. Anencephaly
B. Ebstein's anomaly (Correct Answer)
C. Caudal dysgenesis syndrome
D. Elfin facies

Explanation: **Explanation:** The correct answer is **Ebstein’s anomaly**. Lithium is a mood stabilizer used primarily for Bipolar Disorder. When taken during the first trimester of pregnancy, it acts as a teratogen, specifically affecting cardiac development. **1. Why Ebstein’s Anomaly is Correct:** Ebstein’s anomaly is a rare congenital heart defect characterized by the **downward displacement of the tricuspid valve** leaflets into the right ventricle ("atrialization" of the right ventricle). While the absolute risk remains low (approx. 1 in 1,000 to 2,000 exposures), it represents a significant increase compared to the general population. **2. Analysis of Incorrect Options:** * **Anencephaly:** This is a neural tube defect (NTD). NTDs are more commonly associated with **Valproate** or Carbamazepine use during pregnancy, not Lithium. * **Caudal dysgenesis syndrome:** This is a rare malformation (sacral agenesis) highly specific to **maternal diabetes mellitus**. * **Elfin facies:** This facial phenotype (along with hypercalcemia and supravalvular aortic stenosis) is characteristic of **Williams Syndrome**, a genetic deletion on chromosome 7. **Clinical Pearls for NEET-PG:** * **Monitoring:** If a pregnant woman must continue Lithium, fetal echocardiography is recommended at 18–22 weeks. * **Dosage:** Lithium clearance increases during pregnancy (due to increased GFR) and drops abruptly at delivery; close serum monitoring is vital to avoid toxicity. * **Breastfeeding:** Lithium is generally discouraged during breastfeeding as it is excreted in milk and can cause "Floppy Baby Syndrome" (hypotonia, cyanosis). * **Alternative:** Lamotrigine is often considered a safer mood stabilizer during pregnancy regarding structural malformations.

Question 4: Which of the following antipsychotic medications carries the least risk of metabolic side effects?

A. Risperidone
B. Olanzapine
C. Ziprasidone (Correct Answer)
D. Clozapine

Explanation: **Explanation:** The metabolic profile of second-generation (atypical) antipsychotics is a high-yield topic for NEET-PG. These drugs are associated with weight gain, dyslipidemia, and insulin resistance due to their affinity for H1 and 5-HT2C receptors. **Why Ziprasidone is Correct:** **Ziprasidone** (along with Aripiprazole and Lurasidone) is considered **metabolically neutral**. It has a very low affinity for histamine (H1) receptors, resulting in minimal weight gain and negligible impact on blood glucose or lipid levels. While it carries a risk of QTc prolongation, its metabolic safety profile is superior to most other atypicals. **Analysis of Incorrect Options:** * **Clozapine (D) & Olanzapine (B):** These are the **worst offenders**. They have the highest risk of significant weight gain, sedation, and new-onset Diabetes Mellitus. Clozapine is the most metabolic-heavy, followed closely by Olanzapine. * **Risperidone (A):** This drug carries a **moderate risk**. While less severe than Olanzapine, it still causes significant weight gain and is notably associated with the highest risk of hyperprolactinemia among atypicals. **NEET-PG High-Yield Pearls:** * **Mnemonic for Metabolic Risk (Highest to Lowest):** "**C**ome **O**n **Q**uietly **R**isperidone **A**nd **Z**iprasidone" (**C**lozapine > **O**lanzapine > **Q**uetiapine > **R**isperidone > **A**ripiprazole/**Z**iprasidone). * **Ziprasidone** must be taken **with food** (minimum 500 calories) for adequate absorption. * **Monitoring:** Patients on Clozapine/Olanzapine require regular monitoring of BMI, waist circumference, fasting glucose, and lipid profiles.

Question 5: Beta-adrenergic receptor antagonists such as propranolol are used in the treatment of which of the following conditions?

A. Performance anxiety
B. Substance use disorders
C. Lithium tremor
D. All of the above (Correct Answer)

Explanation: **Explanation:** Beta-adrenergic receptor antagonists (Beta-blockers), specifically **Propranolol**, are widely used in psychiatry to manage the peripheral autonomic symptoms of anxiety and specific drug-induced side effects. * **Performance Anxiety:** Propranolol is the drug of choice for "stage fright." It works by blocking the peripheral effects of adrenaline, thereby reducing tremors, palpitations, tachycardia, and sweating without causing the sedation associated with benzodiazepines. * **Lithium-Induced Tremor:** Fine resting tremors are a common side effect of Lithium therapy. Propranolol is the most effective treatment for managing these tremors, allowing patients to continue their mood-stabilizer regimen. * **Substance Use Disorders:** Beta-blockers are used as adjuncts in managing **Alcohol Withdrawal** (to control autonomic hyperactivity like tachycardia and hypertension) and are also used to treat **Akathisia** (subjective restlessness) caused by antipsychotics. **Clinical Pearls for NEET-PG:** 1. **Akathisia:** Propranolol is the **first-line treatment** for antipsychotic-induced akathisia. 2. **Specific Phobia:** It is used specifically for the "Performance Type" of Social Anxiety Disorder. 3. **Contraindications:** Always screen for **Asthma or COPD** before prescribing, as non-selective beta-blockers can cause life-threatening bronchospasm. They should also be avoided in patients with insulin-dependent diabetes (masks hypoglycemia symptoms) and bradycardia. 4. **Lipophilicity:** Propranolol is highly lipophilic, allowing it to cross the blood-brain barrier effectively.

Question 6: A patient with maniac depressive psychosis is on lithium, clozapine, and fluphenazine. During the course of treatment, he developed seizures, tremors, excessive thirst, and recurrent episodes of urination. Which drug is most likely responsible for these complications?

A. Lithium (Correct Answer)
B. Clozapine
C. Fluphenazine
D. None of the above

Explanation: ### Explanation The correct answer is **Lithium**. This question tests the ability to differentiate the side effect profiles of multiple psychotropic drugs administered simultaneously. **Why Lithium is the correct answer:** Lithium has a narrow therapeutic index and is notorious for multisystem side effects. The symptoms described in the patient are classic manifestations of Lithium toxicity and its physiological effects: * **Excessive thirst (Polydipsia) and Recurrent urination (Polyuria):** Lithium causes **Nephrogenic Diabetes Insipidus** by interfering with the action of ADH (Vasopressin) on the collecting ducts of the kidney. * **Tremors:** Fine tremors are a common side effect, while coarse tremors often indicate Lithium toxicity. * **Seizures:** At toxic levels (>2.0 mEq/L), Lithium is highly neurotoxic and can precipitate seizures. **Why other options are incorrect:** * **Clozapine:** While Clozapine is the antipsychotic most strongly associated with a dose-dependent risk of **seizures**, it does not cause polyuria or polydipsia. Its hallmark side effects are agranulocytosis, sialorrhea (drooling), and myocarditis. * **Fluphenazine:** A high-potency typical antipsychotic primarily associated with **Extrapyramidal Side Effects (EPS)** like dystonia, akathisia, and parkinsonism. It does not cause the renal symptoms described. **High-Yield Clinical Pearls for NEET-PG:** * **Monitoring:** Therapeutic drug monitoring (TDM) is essential for Lithium. Target serum levels: 0.6–1.2 mEq/L (Prophylaxis/Maintenance) and 0.8–1.5 mEq/L (Acute Mania). * **Renal Impact:** Lithium is the drug of choice for Bipolar Disorder but is contraindicated in renal failure. * **L-C-S Triad:** Remember **L**ithium, **C**lozapine, and **S**ertraline (in SSRI withdrawal) can all lower the seizure threshold, but only Lithium explains the constellation of renal and neurological symptoms provided.

Question 7: What is the best choice of antianxiety agent for a 40-year-old woman with generalized anxiety disorder and a history of benzodiazepine abuse?

A. zolpidem
B. flurazepam
C. clonazepam
D. buspirone (Correct Answer)

Explanation: **Explanation:** The correct answer is **Buspirone**. **Why Buspirone is the best choice:** Generalized Anxiety Disorder (GAD) often requires long-term pharmacological management. In a patient with a history of **substance abuse or benzodiazepine (BZD) dependence**, BZDs are contraindicated due to their high potential for addiction, tolerance, and withdrawal. * **Mechanism:** Buspirone is a **5-HT1A partial agonist**. * **Clinical Advantage:** Unlike BZDs, it has **no potential for abuse or addiction**, does not cause sedation, and does not potentiate the effects of alcohol. This makes it the ideal "non-addictive" alternative for chronic anxiety in high-risk patients. **Why other options are incorrect:** * **Zolpidem (A):** This is a non-benzodiazepine sedative-hypnotic ("Z-drug") used primarily for insomnia, not GAD. While it has a different structure, it still carries a risk of dependence and misuse. * **Flurazepam (B) & Clonazepam (C):** Both are benzodiazepines. Flurazepam is long-acting and used for insomnia; Clonazepam is used for GAD and panic disorder. Both are strictly avoided in patients with a history of drug abuse due to the risk of relapse and physiological dependence. **NEET-PG High-Yield Pearls:** * **Lag Period:** Buspirone takes **2–4 weeks** to show therapeutic effects; it is not useful for acute anxiety attacks (unlike BZDs). * **Side Effects:** Dizziness, nausea, and headache are common. It does *not* cause muscle relaxation or anticonvulsant effects. * **Drug of Choice for GAD:** While SSRIs/SNRIs are first-line, Buspirone is a specific high-yield answer for GAD patients with **addiction history**.

Question 8: Long-term antipsychotic use may cause which of the following?

A. Depression
B. Mania
C. Schizophrenia
D. Tardive dyskinesia (Correct Answer)

Explanation: **Explanation:** **Correct Answer: D. Tardive dyskinesia** **Mechanism:** Tardive dyskinesia (TD) is a late-onset extrapyramidal side effect (EPS) resulting from the chronic use of dopamine receptor antagonists (antipsychotics). The underlying pathophysiology involves **dopamine receptor supersensitivity**. Long-term blockade of $D_2$ receptors in the nigrostriatal pathway leads to an up-regulation and increased sensitivity of these receptors. Consequently, even small amounts of dopamine trigger an exaggerated response, manifesting as involuntary, choreoathetoid movements, typically involving the tongue, face (e.g., lip-smacking), and extremities. **Analysis of Incorrect Options:** * **A. Depression:** While some patients may experience "post-psychotic depression" or "neuroleptic-induced deficit syndrome" (mimicking negative symptoms), antipsychotics are not a primary cause of clinical depression; in fact, some are used as adjuncts in treatment-resistant depression. * **B. Mania:** Antipsychotics are dopamine antagonists and are used to *treat* mania. They do not cause mania. * **C. Schizophrenia:** Antipsychotics are the primary treatment for schizophrenia. While "supersensitivity psychosis" is a theoretical risk upon abrupt withdrawal, the drugs do not cause the disease itself. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Elderly females and patients with affective disorders are at higher risk for TD. * **Management:** The first step is to reduce the dose or switch to an atypical antipsychotic with lower $D_2$ affinity (e.g., **Clozapine** or Quetiapine). * **Treatment:** VMAT-2 inhibitors (e.g., **Valbenazine**, Deutetrabenazine) are now FDA-approved for TD. * **Warning:** Anticholinergics (like Trihexyphenidyl) often **worsen** TD symptoms, unlike other EPS.

Question 9: A middle-aged man presents with restlessness, pacing, and hand tremor. He reports taking haloperidol for mania for the past two months. Which of the following conditions is the patient most likely suffering from?

A. Dystonia
B. Restless legs syndrome
C. Akathisia (Correct Answer)
D. Anhedonia

Explanation: ### Explanation **Correct Option: C. Akathisia** The patient is presenting with **Akathisia**, the most common Extrapyramidal Side Effect (EPS) associated with typical antipsychotics like Haloperidol. Akathisia is characterized by a subjective feeling of inner restlessness and an objective need to move. Clinically, this manifests as **pacing, shifting weight from foot to foot, or inability to sit still**. It typically occurs within days to weeks of starting or increasing the dose of a dopamine antagonist. **Analysis of Incorrect Options:** * **A. Dystonia:** This involves involuntary, sustained muscle contractions leading to abnormal postures (e.g., torticollis, oculogyric crisis). It usually occurs acutely (within hours to days) rather than after two months. * **B. Restless Legs Syndrome (RLS):** While symptoms are similar, RLS typically occurs at rest or before sleep and is relieved by movement. It is not primarily caused by antipsychotics, though they can exacerbate it. * **D. Anhedonia:** This is a psychological symptom (inability to feel pleasure) common in depression and schizophrenia, not a motor restlessness disorder. **High-Yield Clinical Pearls for NEET-PG:** * **Management of Akathisia:** The first-line treatment is **Beta-blockers (Propranolol)**. Centrally acting benzodiazepines or anticholinergics (Benztropine) are second-line. * **Timeline of EPS:** 1. **Acute Dystonia:** Hours to days. 2. **Akathisia:** Days to weeks. 3. **Drug-induced Parkinsonism:** Weeks to months. 4. **Tardive Dyskinesia:** Months to years (long-term use). * **Key Distinction:** Unlike Parkinsonian tremors, the "tremor" in akathisia is often just a manifestation of the constant urge to move.

Question 10: Stevens-Johnson syndrome is a known side effect of which of the following medications?

A. Carbamazepine (Correct Answer)
B. Lithium
C. Clozapine
D. Clonazepam

Explanation: **Explanation:** **Stevens-Johnson Syndrome (SJS)** and its more severe variant, Toxic Epidermal Necrolysis (TEN), are life-threatening mucocutaneous reactions characterized by epidermal detachment. **Carbamazepine** is a notorious trigger for SJS, particularly in patients of Asian descent. This is strongly associated with the **HLA-B*1502 allele**; screening for this genetic marker is recommended before initiating treatment to mitigate risk. Other common psychiatric drugs causing SJS include Lamotrigine and Phenytoin. **Analysis of Incorrect Options:** * **Lithium:** Its most characteristic side effects include fine tremors, polyuria (nephrogenic diabetes insipidus), hypothyroidism, and teratogenicity (Ebstein’s anomaly). It does not typically cause SJS. * **Clozapine:** This atypical antipsychotic is most famously associated with **agranulocytosis** (requiring regular CBC monitoring), seizures, and myocarditis. * **Clonazepam:** As a benzodiazepine, its primary side effects are sedation, ataxia, and potential for dependence/withdrawal. Skin reactions are extremely rare. **Clinical Pearls for NEET-PG:** * **Lamotrigine** is the mood stabilizer with the highest risk of SJS if titrated too rapidly ("Start low, go slow"). * **HLA-B*1502** is the specific screening marker for Carbamazepine-induced SJS in Asian populations. * **HLA-A*3101** is another marker associated with Carbamazepine-induced hypersensitivity in Europeans. * If a patient on Carbamazepine or Lamotrigine develops a rash or mucosal involvement, the drug must be **stopped immediately**.

Practice by Chapter

Principles of Psychopharmacology

Practice Questions

Antipsychotic Medications

Practice Questions

Antidepressant Medications

Practice Questions

Mood Stabilizers

Practice Questions

Anxiolytics and Hypnotics

Practice Questions

Stimulants and Cognitive Enhancers

Practice Questions

Pharmacokinetics and Pharmacodynamics

Practice Questions

Drug Interactions

Practice Questions

Adverse Effects and Management

Practice Questions

Pharmacogenomics in Psychiatry

Practice Questions

Special Populations Considerations

Practice Questions

Treatment Algorithms and Guidelines

Practice Questions

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free